Inserted block 1000 times larger than expected

Rhino Rhino for Windows
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16

Oh boy, I lost you on the uncorrected export file…

On my side, to make it simple we can bypass the export.

  1. New Large Objects Meters file; make circle 10m radius; Saveas Circle.3dm;
  2. New Large Objects Meters file; create layout;
    a. insert Circle.3dm as a block in model space, results in circle with 10m;
    b. import Circle.3dm in model space, results in circle with 10m;
    c. insert Circle.3dm as a block in Layout, results in circle with 10000mm;
    d. import Circle.3dm in Layout, results in circle with 10mm!!!

I will not get into the inches issue. The real can of worms is why CAD software needs to scale geometry to convert between units. It makes absolutely no sense and it is one of the mysteries of the world. It would be like you would need to scale your fonts when you change units in Word.